渤海J气田湖底扇储层精细刻画  

Fine reservoir description of sublacustrine fan in Bohai J gas field

作　　者：严皓 李宾 谷志猛 文佳涛 YAN Hao;LI Bin;GU Zhimeng;WEN Jiatao(Tianjin Branch of CNOOC Ltd.,Tianjin 300459,China)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300459

出　　处：《断块油气田》2020年第3期299-303,共5页Fault-Block Oil & Gas Field

基　　金：国家科技重大专项课题“渤海油田高效开发示范工程”(2016ZX05058-001)。

摘　　要：随着渤海勘探力度加强,岩性圈闭逐渐成为新的勘探目标。J气田是渤海新评价的以湖底扇沉积为主的气田,探井证实该湖底扇岩性砂体储层横向变化快,砂体分布范围和内部连通关系十分复杂。在油田资料有限的情况下,将地震、地质相结合,形成了一套新的湖底扇储层精细刻画流程。首先,通过地震分频技术提高目标体的分辨率,在地震沉积学理论指导下,用方差体代替传统地震成果数据,利用地层切片技术较好地刻画出湖底扇砂体平面展布规律及纵向沉积演化特征;然后,以测井结果和地震相为依据,优选出平均瞬时频率属性和地层倾角属性,结合地质认识刻画出湖底扇内扇、中扇和外扇,建立了湖底扇精细沉积模式;最后,根据地震相和流体在地震剖面上的响应特征以及岩石物理分析,正演模拟确定了湖底扇砂体内部的叠置和连通关系,规避了构造高部位含水风险。上述精细表征技术,为前期开发方案研究奠定了可靠基础,同时对该区其他类似湖底扇研究也有指导意义。With the strengthening of exploration in the Bohai Sea,lithologic traps have gradually become new exploration targets.J gas field is a newly evaluated gas field in Bohai Sea,which is dominated by sublacustrine fan.The exploratory well confirmed that the lateral lithologic sand body reservoir of the sublacustrine fan changes rapidly,and the distribution range and internal connection relationship of the sand body are very complicated.With limited oilfield data,a new process of fine reservoir characterization of sublacustrine fan has been formed by seismology and geology.Firstly,seismic frequency division technology is used to improve the resolution of target body.Under the guidance of seismic sedimentology theory,variance volume is used instead of traditional data.Stratigraphic slicing technology is used to better characterize the horizontal distribution law and vertical sedimentary evolution characteristics of sublacustrine fan.Then,based on the logging results and the seismic facies,the average instantaneous frequency property and the dip angle attribute are selected.Combined with the geological understanding,the inner fan,the middle fan and the outer fan are described,and the fine sedimentary mode of sublacustrine fan is established.Finally,according to the response characteristics of seismic facies and fluids on seismic profile and petrophysical analysis,forward modeling determines the superposition and interconnection relationship within the sublacustrine fan to avoid the risk of water cut in the high part of the structure.The above-mentioned fine representation technology of sublacustrine fan has laid a reliable material foundation for the research of the previous development plan.This method also has guiding significance for other similar sublacustrine fan research in this area.

关 键 词：湖底扇 地震分频 地震沉积学 地震属性 正演模拟 

分 类 号：TE122[石油与天然气工程—油气勘探]